repo-install-test: sort centos pkgs from repoquery

Apparently the output of repoquery isn't always sorted, it started
failing on jenkins after moving the test inside qemu. Add an explicit
sort.

Fix for:
  + comm -23 osmocom_packages_all.txt blacklist.txt
  comm: file 1 is not in sorted order

Related: OS#5365
Change-Id: Icb00df102555e06b66b1c2597488b625e3c77f1c

scripts/repo-install-test/run-inside.sh

@@ -336,6 +336,7 @@ install_repo_packages_centos() {
 		--repoid="$(proj_with_underscore "$PROJ")" \
 		--archlist="x86_64,noarch" \
 		--qf="%{name}" \
+		| sort \
 		> osmocom_packages_all.txt
 
 	cat osmocom_packages_all.txt